The package 'zwcalx6' version 0.0.490 in the RubyGems ecosystem is flagged as malicious code according to the OpenSSF malicious packages database (MAL-2026-9849). This is a supply chain threat involving a package containing harmful code rather than a vulnerability in the package itself. No further technical details or exploitation methods are documented in the provided data.

Use of the malicious package 'zwcalx6' version 0.0.490 could lead to execution of harmful code within environments that install or run this package. The exact impact depends on the malicious payload, which is not detailed here. No known exploits have been reported, but the presence of malicious code poses a risk to systems using this package version.

No official patch or remediation is documented. The best mitigation is to avoid using the affected version (=0.0.490) of the 'zwcalx6' package. Users should verify package integrity and source authenticity before installation. Monitor vendor or repository advisories for updates or removal of the malicious package.